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[LayaAir 1.0]安卓机截图变成黑块，ios和pc没问题

1.7.22的版本，用ide创建的微信小游戏模板，ios和模拟器里面都能正常显示红色色块，安卓机就只能看到黑色色块了

private function test():void

		{

			var sp1:Sprite = new Sprite();

			sp1.graphics.drawRect(0,0,300,200,"#ff0000");

			var htmlCanvas:HTMLCanvas = sp1.drawToCanvas(300,200,0,0);

			Laya.timer.once(1000,this,function():void{

			var texture:Texture = new Texture(htmlCanvas);

			var sp2:Sprite = new Sprite();

			sp2.graphics.drawTexture(texture);

			Laya.stage.addChild(sp2);

			});

		}